Heating-boiler



(No Model.) Q 2 Sheets-Sheet 2.

S. BARTLEY.

HEATING BOILER. No. 530,155. Patented Dec. 4, 1894.

, Harri-"En STATES PATENT @rnron.

SAMUEL BARTLEY, OF BARTLEY, NEW JERSEY.

H EATING-BOILER.

SPECIFICATION formingpart of Letters Patent No. 530,155, dated December4, 1894.

Appli filed January 15,1894. Serial No. 496.895. (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL BARTLEY, a citizen of the United States,residing at Bartley, Morris county, New Jersey, have invented certainnewand usefulImprovements in Heating-Boilers, fully described andrepresented in the following specification and the accompanyingdrawings, forminga part of the same.

This invention consists in the specific construction for a steam boilerherein shown, described and claimed.

In the annexed drawings, Figure 1 is an elevation, partly in sectionwhere hatched,of a boiler embodying my improvements. Fig. 2 is a view ofthe under side of the upper section, and Fig. 3 is a plan of the lowersection.

The lower section A is formed with an annular water space a inclosedbetween an outer cylindrical wall and an inner corrugated wall, andforms the fire pot I) provided with grate g. At the top of the waterspace a are four oval apertures 0 and beneath such apertures are bridges0 extending between the outer and inner walls of the section.

The upper section B consists of a shallow cylindrical shell superposedupon the section A and provided with an annular water leg B extendeddownward from the under side of the section within the lower section A,and with an intermediate row of smoke fiues 0 connecting the fire pot bwith the smoke chamber D having smoke outlet D which is superposed uponthe section B. The water leg B is formed with an outer corrugated walland with an inner cylindrical wall inclosing the feeder F which suppliesfuel to the fire pot.

Apertures p are formed in the bottom of the dome section B similar toand adapted to register with the apertures 0 in the lower section toafford a circulation of water between the said sections.

Raised seats 8 are formed around the peripheries of the opposed faces ofboth sections and around the apertures 0 and 19 therein, and a packing25, preferably formed of corrugated sheet copper, is interposed betweensuch seats, and the sections are then bolted together.

To secure the sections together when in p and is screwed at one end intoa threaded hole in the bridge 0 with its opposite end projected througha hole d in the upper side of the sectionB which is formed with atapering seat d in its upper end; and the closed nut n having a conicalface fitted to such seat is then screwed upon the bolt and turnedsufficiently upon its seat 01 to draw the sections together upon thepacking t with the force necessary to prevent leakage at such joint.

The provision of a conical surface of contact between the nut n and topof the upper section permits the employment of a hole d sufficientlylarge for easy access in applying the bolt, while eifectively centeringthe latterin tightening the same, and offering an eifective means ofclosing the hole d against leakage. Heretofore it has been common tobolt a series of horizontal sections together to form a vertical boilerby long bolts pass ing through each section of the series, whereby theunequal expansion of the metal in the sections and the bolts operated toproduce undue strain upon the latter and their consequent injury forsuch use; but by my invention, while the dome section is of considerabledepth over all, the drum portion is made shallow in order that shortbolts may be employed for such purpose and in order to minimize theunequalexpansion and render the same inappreciable.

I am aware of the patent to Drake, No. 464,065, showing a boilercomposed of an annular lower section with a superposed section providedwith a series of vertical lines; and of the patent to Hogan, No.326,982, disclosing a boiler comprising aseries of superposed annularsections with the upper section provided with a series of drop tubesextending downward within the lower sections to the fire pot. Myinvention differs from these constructions in the provision of the uppersection with a series of fiues and a central depending water leg formingwith the lower annular section an annular smoke space furnishing a freeand direct passage from the fire pot to the smoke flue; while offering aclear heating surface on each side of such annular passage for theabsorption of heat from the products of combustion as they pass to thefines. The provision of drop tubes in boilers having a central fuelmagazine, not only shields the contiguous portions of the sections fromthe heated gases in their upward passage, but obstructs the flow of suchproducts of combustion and thus injures the draft; where the uppersection is formed as a cylindrical drum with vertical fines therein, asin my construction. I therefore disclaim the constructions disclosed inthe said patents, limiting myself to those claimed herein.

Having thus set forth the nature of the invention, what I claim hereinis The steam boiler comprising the lower fire pot section formed withannular water space corrugated upon its inner periphery, a superposedshallow dome section provided with central annular water leg corrugatedupon its outer periphery depending within the fire pot section andprovided with smoke fines through such section leading from the firepot, registering circulation apertures in the adjacent faces of the twosections, perforated bridges in the fire pot section extending betweenits inner and outer walls and disposed adjacent to and directly belowthe circulation apertures therein, holes in the upper side of 2 5 thedome section directly above its circulation apertures and provided intheir upper ends with conical seats, bolts applied at one end to theperforations in the said bridges and at the other end to the holes inthe top of the 0 witnesses.

SAMUEL BARTLEY. Witnesses:

'I. B. DICKERSON, L. N. BARTLEY.

